The filters can snake around components, conform to a radius-type bezel, or sit in a curved track. They are available in various pore sizes: 20 through 45-ppi green and 10 through 60-ppi gray or black. A solvent-resistant, two-part bonding material unites frame and filter media. The filters meet a variety of standards and classifications: UL 94HF-1, UL 900 Class 2 CE, Telcordia Nebs GR-78-Core, GR-63-Core, and RoHS Compliance.